不同胎次梅山猪的繁殖性能分析OA

[Objectives]The patterns of changes in reproduction performance of Meishan pigs with differ-ent parity were clarified to provide practical basis for efficiently utilizing Meishan pig germplasm and optimiz-ing the population structure of sow.[Methods]120 healthy Meishan sows aged 14-42 months and weighed 145-198 kg at a Meishan pig breeding farm in Taicang,Jiangsu Province,China were divided into primiparous(1st parity),middle-parity(2nd-3rd parity and 4th-5th parity),and high-parity(≥6th parity)groups according to par-ity from 2024 to 2025.Indexes including the total litter size,number of live-born piglets,birth weight of piglet,and survival rate were recorded and analyzed under the same conditions of feeding and management.[Results]The reproduction performance of Meishan sows had an"increase-stabilization-slight decline"trend with the in-crease of parity.The total litter size of sows in the 2nd-3rd parity and 4th-5th parity group was 14.80±2.09 and 14.50±2.00,respectively,both significantly higher than that in the 1st parity group(12.10±1.81)(P＜0.05).The number of live-born piglets and the number of weaned piglets in the 2nd-3rd parity and 4th-5th parity group was 13.90±1.93 and 13.60±1.78,12.70±1.82 and 12.50±1.69,respectively.The survival rate after weaning in the 2nd-3rd parity and 4th-5th parity group was(94.60±2.46)%and(94.20±2.72)%,both significantly higher than that in the 1st parity group(90.10±3.21)%(P＜0.05).The reproduction indexes of sows in the high-parity(≥6th parity)group showed a slight decline,but they still maintained relatively good reproductive capacity overall.[Conclusions]Meishan sows in the 2nd-3rd parity and 4th-5th parity have the best reproduction performance,with both higher litter size and better survival rate of piglet,making them suitable as the core population for breeding.